Reassembly Of 2900-40 Main Valve; Lubricants And Sealants; Assembly Procedure With Metal Seats; Assembly Procedure With O-Ring Seats - GE Baker Hughes 2900-40 Series Maintenance Manual

XVI. Reassembly of the 2900-40 Main Valve
A. Lubricants and Sealants
1. Operating temperatures below -40°F (-40°C), consult the
Factory.
2. Operating temperatures above -40°F (-40°C)
a. Lubricate all O-Rings, except silicone, spring energized
seals, and back-up rings sparingly with silicone grease
(BHGE P/N SP505).
b. Seal all pipe threads with Teflon tape or pipe sealant
(BHGE P/N SP364-AB).
c. Lubricate standard threads and bearing points
with nickel graphite N5000 (BHGE P/N 4114507) or
equivalent.
B. Assembly Procedure with Metal
Seats
1. If the valve Nozzle was removed, apply thread lubricant to
the nozzle threads before reinstalling in the Base. Insert it
into the inlet flange of the Base, and torque to the correct
value listed in Table 9.
2. Assemble the disc/disc holder as follows:
a. Prior to assembly of the Disc into the Disc Holder,
Table 9: Nozzle Torque Values +0 / -10%
Orifice
D
E
F
G
H
J
K
L
M
N
P
Q
R
T
Note 1: DO NOT USE impact wrench on "D" through "K" orifice
Nozzles.
© 2019 Baker Hughes, a GE company. All Rights Reserved.
Required Torque 1
ft-lbs Nm
165 223.71
165 223.71
165 223.71
145 196.59
165 223.71
335 454.20
430 583.00
550 745.70
550 745.70
640 867.72
1020 1382.93
1400 1898.15
1070 1450.73
1920 2603.17
remove the Disc Retainer from the back of the Disc.
Use 1000 grit grinding compound on the bearing
surface to grind the Disc into the Disc Holder to
properly establish the bearing surface.
b. Place the Disc Retainer into the groove in the disc. The
Disc with the Disc Retainer should "snap" into the Disc
Holder pocket with moderate finger or hand force.
Do not use excessive force to assemble these parts.
Be sure that the Disc is free to "wobble" after it is in
place.
C. Assembly Procedure with O-Ring
Seats
1. If the valve Nozzle was removed, apply thread lubricant to
the nozzle threads before reinstalling in the Base. Insert it
into the inlet flange of the Base, and torque to the correct
value listed in Table 9.
2. Assemble the disc/disc holder as follows:
a. For disc sizes "D" through "J", reassemble the Disc
Holder using a new O-Ring, O-Ring Retainer, and new
Lock Screw(s). Refer to Table 10 for the proper torque.
These Disc Holders are ready for the next step.
Table 10: Disc Holder Torque Values
No. of
Orifice Bolt Size
Bolts
D 1 1/4-28UNF
E 1 1/4-28UNF
F 1 1/4-28UNF
G 1 1/4-28UNF
H 1 1/4-28UNF
J 3 #10-32UNF
K 3 #8-32NC
L 3 #8-32NC
M 4 #8-32NC
N 4 #8-32NC
P 4 1/4-28UNF
Q 4 1/4-28UNF
R 4 1/4-28UNF
T 4 1/4-28UNF
Consolidated 2900-40 Series POSRV Maintenance Manual | 39
Torque
in-lbs N-m
75 8.5
± 3 ± 0.3
75 8.5
± 3 ± 0.3
75 8.5
± 3 ± 0.3
75 8.5
± 3 ± 0.3
75 8.5
± 3 ± 0.3
30 3.4
± 2 ± 0.2
18 2.0
± 1 ± 0.1
18 2.0
± 1 ± 0.1
18 2.0
± 1 ± 0.1
18 2.0
± 1 ± 0.1
75 ± 3 8.5 ± 0.3
75 8.5
± 3 ± 0.3
75 8.5
± 3 ± 0.3
75 8.5
± 3 ± 0.3